#include<Arduino.h>
#include <lvgl.h>
#include <TFT_eSPI.h>
/*If you want to use the LVGL examples,
  make sure to install the lv_examples Arduino library
  and uncomment the following line.
*/
#include <demos/lv_demos.h>
#include "UI/gui_guider.h"

// HW w/h
static const uint16_t lcdWidth  = 240;
static const uint16_t lcdHeight = 280;

/*Change to your screen resolution*/
static const uint16_t screenWidth  = 280;
static const uint16_t screenHeight = 240;

#define DISPLAY_BUF_SIZE (screenWidth * 60)
static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[DISPLAY_BUF_SIZE];
static lv_color_t buf_b[DISPLAY_BUF_SIZE];

TFT_eSPI tft = TFT_eSPI(lcdWidth, lcdHeight); /* TFT instance */

#if LV_USE_LOG != 0
/* Serial debugging */
void my_print(const char * buf)
{
    Serial.printf(buf);
    Serial.flush();
}
#endif

/* Display flushing */
void my_disp_flush( lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p ) {
    uint32_t w = ( area->x2 - area->x1 + 1 );
    uint32_t h = ( area->y2 - area->y1 + 1 );

    tft.startWrite();
    tft.setAddrWindow( area->x1, area->y1, w, h );
    tft.pushColors( ( uint16_t * )&color_p->full, w * h, true );
    tft.endWrite();

    lv_disp_flush_ready( disp );
}

void lvgl_setup()
{
    Serial.begin( 115200 ); /* prepare for possible serial debug */

    String LVGL_Arduino = "Hello LVGL! ";
    //LVGL_Arduino += String('V') + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();

    Serial.println( LVGL_Arduino );
    Serial.println( "I am LVGL_Arduino" );

    lv_init();

#if LV_USE_LOG != 0
    lv_log_register_print_cb( my_print ); /* register print function for debugging */
#endif

    tft.begin();          /* TFT init */
    tft.setRotation( 1 ); /* Landscape orientation, flipped */
    /*Set the touchscreen calibration data,
     the actual data for your display can be acquired using
     the Generic -> Touch_calibrate example from the TFT_eSPI library*/
   // uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
   // tft.setTouch( calData );

    lv_disp_draw_buf_init(&draw_buf, buf, buf_b, DISPLAY_BUF_SIZE);

    /*Initialize the display*/
    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);
    /*Change the following line to your display resolution*/
    disp_drv.hor_res = screenWidth;
    disp_drv.ver_res = screenHeight;
    disp_drv.flush_cb = my_disp_flush;
    disp_drv.draw_buf = &draw_buf;
    lv_disp_drv_register(&disp_drv);

    /*Initialize the (dummy) input device driver*/
    //static lv_indev_drv_t indev_drv;
    //lv_indev_drv_init( &indev_drv );
    //indev_drv.type = LV_INDEV_TYPE_POINTER;
    //indev_drv.read_cb = my_touchpad_read;
    //lv_indev_drv_register( &indev_drv );

#if 1
    /* Create simple label */
    setup_ui(&guider_ui);
    // setup_scr_screen(&guider_ui);
#else
    /* Try an example from the lv_examples Arduino library
       make sure to include it as written above.
    lv_example_btn_1();
   */

    // uncomment one of these demos
    // lv_demo_widgets();            // OK
    // lv_demo_benchmark();          // OK
    // lv_demo_keypad_encoder();     // works, but I haven't an encoder
    // lv_demo_music();              // NOK
    // lv_demo_printer();
    // lv_demo_stress();             // seems to be OK

#endif
    Serial.println( "Setup done" );
}

void lvgl_loop_func() {
    lv_timer_handler(); /* let the GUI do its work */
    delay(1);
}